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Use GCC builtins for trunc functions if desired.

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This patch is using the corresponding GCC builtin for truncf, trunc,
truncl and truncf128 if the USE_FUNCTION_BUILTIN macros are defined to one
in math-use-builtins.h.

This is the case for s390 if build with at least --march=z196 --mzarch.
Otherwise the generic implementation is used.  The code of the generic
implementation is not changed.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Stefan Liebler
2019-12-11 15:09:22 +01:00
parent 62560ee840
commit 1ac9c1cf87
6 changed files with 37 additions and 0 deletions
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5
sysdeps/generic/math-use-builtins.h
View File

@ -41,4 +41,9 @@
#define USE_CEILL_BUILTIN 0
#define USE_CEILF128_BUILTIN 0
#define USE_TRUNC_BUILTIN 0
#define USE_TRUNCF_BUILTIN 0
#define USE_TRUNCL_BUILTIN 0
#define USE_TRUNCF128_BUILTIN 0
#endif /* math-use-builtins.h */

6
sysdeps/ieee754/dbl-64/s_trunc.c
View File

@ -22,11 +22,16 @@
#include <math_private.h>
#include <libm-alias-double.h>
#include <math-use-builtins.h>
double
__trunc (double x)
{
#if USE_TRUNC_BUILTIN
return __builtin_trunc (x);
#else
/* Use generic implementation. */
int64_t i0, j0;
int64_t sx;
@ -49,6 +54,7 @@ __trunc (double x)
}
return x;
#endif /* ! USE_TRUNC_BUILTIN */
}
#ifndef __trunc
libm_alias_double (__trunc, trunc)

3
sysdeps/ieee754/float128/float128_private.h
View File

@ -148,6 +148,8 @@
#define USE_FLOORL_BUILTIN USE_FLOORF128_BUILTIN
#undef USE_CEILL_BUILTIN
#define USE_CEILL_BUILTIN USE_CEILF128_BUILTIN
#undef USE_TRUNCL_BUILTIN
#define USE_TRUNCL_BUILTIN USE_TRUNCF128_BUILTIN
/* IEEE function renames. */
#define __ieee754_acoshl __ieee754_acoshf128
@ -355,6 +357,7 @@
#define __builtin_rintl __builtin_rintf128
#define __builtin_floorl __builtin_floorf128
#define __builtin_ceill __builtin_ceilf128
#define __builtin_truncl __builtin_truncf128
/* Get the constant suffix from bits/floatn-compat.h. */
#define L(x) __f128 (x)

6
sysdeps/ieee754/flt-32/s_truncf.c
View File

@ -22,11 +22,16 @@
#include <math_private.h>
#include <libm-alias-float.h>
#include <math-use-builtins.h>
float
__truncf (float x)
{
#if USE_TRUNCF_BUILTIN
return __builtin_truncf (x);
#else
/* Use generic implementation. */
int32_t i0, j0;
int sx;
@ -49,6 +54,7 @@ __truncf (float x)
}
return x;
#endif /* ! USE_TRUNCF_BUILTIN */
}
#ifndef __truncf
libm_alias_float (__trunc, trunc)

6
sysdeps/ieee754/ldbl-128/s_truncl.c
View File

@ -23,11 +23,16 @@
#include <math_private.h>
#include <libm-alias-ldouble.h>
#include <math-use-builtins.h>
_Float128
__truncl (_Float128 x)
{
#if USE_TRUNCL_BUILTIN
return __builtin_truncl (x);
#else
/* Use generic implementation. */
int32_t j0;
uint64_t i0, i1, sx;
@ -54,5 +59,6 @@ __truncl (_Float128 x)
}
return x;
#endif /* ! USE_TRUNCL_BUILTIN */
}
libm_alias_ldouble (__trunc, trunc)

11
sysdeps/s390/fpu/math-use-builtins.h
View File

@ -42,16 +42,22 @@
# define USE_CEILF_BUILTIN 1
# define USE_CEILL_BUILTIN 1
# define USE_TRUNC_BUILTIN 1
# define USE_TRUNCF_BUILTIN 1
# define USE_TRUNCL_BUILTIN 1
# if __GNUC_PREREQ (8, 0)
# define USE_NEARBYINTF128_BUILTIN 1
# define USE_RINTF128_BUILTIN 1
# define USE_FLOORF128_BUILTIN 1
# define USE_CEILF128_BUILTIN 1
# define USE_TRUNCF128_BUILTIN 1
# else
# define USE_NEARBYINTF128_BUILTIN 0
# define USE_RINTF128_BUILTIN 0
# define USE_FLOORF128_BUILTIN 0
# define USE_CEILF128_BUILTIN 0
# define USE_TRUNCF128_BUILTIN 0
# endif
#else
@ -77,6 +83,11 @@
# define USE_CEILL_BUILTIN 0
# define USE_CEILF128_BUILTIN 0
# define USE_TRUNC_BUILTIN 0
# define USE_TRUNCF_BUILTIN 0
# define USE_TRUNCL_BUILTIN 0
# define USE_TRUNCF128_BUILTIN 0
#endif /* ! HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT */
#endif /* math-use-builtins.h */